Extrusion & Post
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PPO Alloy Grade Phase Separation
Problem Phenomenon
[Problem Phenomenon] Delamination and uneven performance of PPO/PS or PPO/PA alloy products
Cause Analysis
Improper processing temperature and shear of the alloy system cause abnormal phase distribution; PPO/PA is a semi-crystalline system, and its crystallization behavior is more affected by the process; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Process according to the alloy grade's dedicated process window; trace temperature and shear records for phase-separated parts; monitor batch performance sampling; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For PPO alloy delamination check the process window; stable phase means stable performance; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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